Not at all. Just pointing out how the flaw you find in Usopp can also be found in Zoro.
Zoro didn't order Luffy on Water 7 though. He expressed what a captain SHOULD do, and left the decision up to Luffy, who then CHOSE to go along with it. What's different about Zou is that Zoro expressed it in an attempt to give Luffy no choice.
So what? This doesn't change that Usopp saved Luffy's life on Dressrosa. It doesn't matter how many times others have done it. You said Usopp is incapable of doing it, and I showed you an instance where he did do it. You can post every Zoro, Luffy, and Sanji fight, and it won't matter because it wouldn't make the instance of Usopp saving Luffy's life non-existent.
Not to mention that Usopp saved Zoro's life from Kizaru as well.
By this logic, Zoro can never be first mate because he threatened to kill Luffy.